How popular is Nadie?

Nadie is an uncommon given name for women. Nadie is an equally rare surname for both adults and children. (2000 U.S. DEMOGRAPHICS)

Which version is better?

Prominent alternative forms of Nadie (OUTSIDE TOP 2000) appearing in the Top 2000 are Nadia(#358 FROM CURRENT RECORDS), Nadine(#1358), Nada, Nadene and Nadya. Other variants, like Naydeen, are seldom used. Usage of these relations of Nadie was widespread in 2005 (USAGE OF 0.1%) and has become significantly lower since (USAGE 0.1%, ▼55.5%). (2016 U.S. SSA RECORDS)